You may find long queues for the Gondola in Borovets after 9:30am, but the simple solution is to jump in a taxi for the 5min ride to the Yastrebetz Express 4 man chair lift (the taxi driver will know where you want to go, there will be no explanation required) and 10levs later you will be on your way to a few nice red runs on the Yastrebetz mountain (gaining almost an hours skiing time on your gondola queuing comrades)